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VE Drop from 3k to 5k RPM??

 
Old 12-21-2018, 07:09 PM
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Default VE Drop from 3k to 5k RPM??

Hey guys, I've noticed my boost (JRSC 1.6L) is higher in the midrange than it should be. The car is on MS3 so I've taken logs and see that my engine VE drops from 3000 to 5000 rpm (weirdly, its almost exactly 3k and 5k). I've also taken logs naturally aspirated (bypass zip-tied open) and exactly the same trend shows. I've posted this in the supercharger forum before, but wanted to get a more general consensus. The leading theory thus far is cam timing being off. Timing belt was replaced about 30k ago by previous owner. I checked the timing marks and everything appears ok, counted 19 teeth between cam timing marks. Any other ideas on what could be causing this? See log below. VE vs rpm in plot below.
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